MAH stands for Marketing Authorisation Holder.
A Marketing Authorisation Holder is a legal entity that has applied for and obtained permission to market and sell a product in a pharmaceutical form. This applies to both human and veterinary medicines. Before any medicinal product can be sold or supplied, it must have a valid Marketing Authorisation (MA).
Once authorised, the MAH is responsible for ensuring that the product is marketed in line with the conditions of that authorisation. Marketing Authorisation allows the product to be marketed by the MAH only in the specific EU Member State where it was granted. However, if the product has been authorised through the centralised procedure, a single authorisation is granted by the European Commission and is valid across all EU Member States.